यदि $1+\frac{\cos \theta}{2}+\frac{\cos 2 \theta}{4}+\frac{\cos 3 \theta}{8}+\ldots = \frac{a-2 \cos \theta}{5+b \cos \theta}$ किसी $a, b \in R$ के लिए है,तो $(a-b)^2=$

  • A
    $0$
  • B
    $64$
  • C
    $36$
  • D
    $125$

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Similar Questions

यदि $\frac{2+4+6+8+\dots+ n \text{ पदों तक}}{1+3+5+7+\dots+ n \text{ पदों तक}} = \frac{37}{36}$ है,तो $n = $

श्रेणी $\frac{3}{1^2} + \frac{5}{1^2 + 2^2} + \frac{7}{1^2 + 2^2 + 3^2} + \dots$ के $11$ पदों का योग क्या है?

श्रेणी $3 \times 1^{2} + 5 \times 2^{2} + 7 \times 3^{2} + \dots$ के $n$ पदों का योग ज्ञात कीजिए।

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$1 + 3 + 7 + 15 + 31 + \dots$ के $n$ पदों तक का योग =

$\frac{1^{2}}{2} + \frac{1^{2}+2^{2}}{3} + \frac{1^{2}+2^{2}+3^{2}}{4} + \frac{1^{2}+2^{2}+3^{2}+4^{2}}{5} + \dots$ $8$ पदों तक $=$

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